EP 0430256 B1 19960207 - Method and equipment for cablibrating output levels of waveform analyzing apparatus
Title (en)
Method and equipment for cablibrating output levels of waveform analyzing apparatus
Title (de)
Verfahren und Anordnung zur Kalibrierung von Ausgangssignalen für einen Wellenformanalyse-Apparat
Title (fr)
Procédé et dispositif pour calibrer le niveau des signeaux de sortie pour des appareils d'analyse d'ondes
Publication
Application
Priority
- JP 31236789 A 19891201
- JP 31236889 A 19891201
Abstract (en)
[origin: EP0430256A2] The present invention relates to a method and equipment for calibrating levels of a waveform analyzing apparatus. An analog switch (24) produces a square wave signal (59) of a low frequency by switching ON and OFF a preset level of DC voltage from a DC voltage setting circuit (23) at a frequency of a control signal from a frequency setting circuit (25). The square signal (59) is applied to the waveform analyzing apparatus (12) and the low frequency output level is calibrated by a theoretical level of a frequency spectrum of the square wave signal. A detecting circuit is calibrated at the low frequency using the calibrated waveform analyzing apparatus, which in turn is calibrated at a high frequency using the calibrated detecting circuit. The detecting circuit, the analog switch (24) and a switch circuit are provided on a performance board attached to an IC tester analog test part which includes the signal generators, the DC voltage setting circuit (23), the frequency setting circuit (25) the waveform analyzing apparatus (12) a DC voltmeter and a test processor (13). Using the switch circuit, desired outputs of the signal generates, analog switch and the detecting circuit are connected to desired inputs of the waveform analyzing apparatus, DC voltmeter and the detecting circuit, thus forming calibration equipment. <IMAGE>
IPC 1-7
IPC 8 full level
G01R 35/00 (2006.01)
CPC (source: EP KR US)
G01R 23/09 (2013.01 - KR); G01R 35/005 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0430256 A2 19910605; EP 0430256 A3 19920415; EP 0430256 B1 19960207; DE 69025277 D1 19960321; DE 69025277 T2 19960822; KR 910012728 A 19910808; KR 940002720 B1 19940331; US 5138267 A 19920811
DOCDB simple family (application)
EP 90122879 A 19901129; DE 69025277 T 19901129; KR 900019706 A 19901201; US 64759390 A 19901129